What is the difference between precision and recall?
This question evaluates your understanding of the trade-off between minimizing false positives and minimizing false negatives in classification tasks.
Why Interviewers Ask This
Precision and Recall are often inversely related. Interviewers ask this to see if you understand when to prioritize one over the other. They want to assess your ability to align model performance with business objectives, such as fraud detection vs. disease screening.
How to Answer This Question
Define Precision as the ratio of true positives to all predicted positives (avoiding false positives). Define Recall as the ratio of true positives to all actual positives (avoiding false negatives). Explain the trade-off: increasing one often decreases the other. Provide examples where high precision is needed (spam filters) versus high recall (cancer detection).
Key Points to Cover
- Precision focuses on prediction accuracy for positives.
- Recall focuses on finding all actual positives.
- High precision minimizes false alarms.
- High recall minimizes missed detections.
Sample Answer
Precision measures how many of the predicted positive cases are actually correct, focusing on avoiding false positives. It is calculated as TP divided by the sum of TP and FP. Recall, or sensitivity, measures how many of…
Common Mistakes to Avoid
- Reversing the definitions of precision and recall.
- Ignoring the trade-off between the two metrics.
- Not giving context-specific examples.
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